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IS 15397 (2003, Reaffirmed 2008) : Portable Fire 
Extinguisher Mechanical Foam Type (Stored 
Pressure) --Specif ication . ICS 13.220.10 


^iiii fc^xai 1 1 m&i^NSSggn 

ssa; t \ • t>sB>5!^N»w 


Satyanarayan Gangaram Pitroda 
Invent a New India Using Knowledge 

fTR" TT^ ^TT teMHI | ^t Wf ^UTJ ^f ^TT ^T^?TT )f 

Bhartrhari — Nitisatakam 
"Knowledge is such a treasure which cannot be stolen" 

(Reaffirmed 2008) 

IS 15397: 2003 
?/HfJC nFfcfi Reaffirmed 2008 

Indian Standard 


ICS 13.220.10 

©BIS 2003 

NEW DELHI 110002 

September 2003 Price Grou P 3 






[ Page i, clause 5, Table 1 , SI No. (ii), col 3 and 4 ] — Insert the following: 

O) (4) 

b) Stainless steel IS 6913 

[ Page 1, Table 1, SI No. (ix)» COl 4 J — Substitute * Having bunting pressure of 
m>tlessth*n5Okgf/cm2'/0r "IS 14933'. 

< Page2 $ ctauselAJine 13 )— Substitute *i.4 mm* for *1.6 mm'. 

( Page 2, clause 7,1.2 ) — In formula, substitute 'oOCr/or *300\ 

( Page 3, clause ISA ) — Substitute *540 ml' for '3 litre' and '270 ml' for 
'1.5 litre*. 

[ Pa£<? 3, dau5£ &2(b) 1 — Delete. 

( Page 3, clause 8 ) — Renumber '8.2* as '8.1.1' and '8.3' as '8,2'. 

( Page 3, clause 9.1 ) — Insert 4 or Post Office Red' after Tire red' and 
4 or No. 538* after 'No. 536'. 

{ \ige 3 f clause 103.3 ) — Delete. 


Reprography Unit, BIS. New Delhi, tadia 






(Page 3, clause 9.1) — Insert the following note at the end: 

'NOTE — In case, body is coated with epoxy powder, there is no need to paint the extinguisher' 

(CED 22) 

Reprography Unit, BIS. New Delhi, India 






[Page 3, clause 9.1 (see also Amendment No. 2)} — Substitute the 
following for the existing; 

"Each extinguisher body except stainless steel body shall be painted either with 
epoxy powder coating or synthetic enamel paint The shade shall be 'Fire Red* 
or Tost Office Red 1 conforming to Shades No. 536 or 538 of IS 5. Stainless 
steel body shall be buffed. 


l Whenever epoxy powder coating is applied on the external surface of mild steel body for 
anti-corrosive treatment, synthetic enamel paint coating is not required. 

1 The body of extinguisher shall be of good finish, clear of alt bum and sharp edges * 
(Page 3, clause 9.3) — Delete the last sentence. 


Reprography Unit* BIS, New Delhi, India 

Fire Fighting Sectional Committee, CED 22 


This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Fire Fighting 
Sectional Committee had been approved by the Civil Engineering Division Council. 

Portable fire extinguisher, mechanical foam type, is one of the first-aid fire fighting appliance. In these extinguishers, 
foam is produced by expelling foam solution by stored air/gas and mechanical aeration at the foam making nozzle. 
This type of extinguisher is suitable for fighting fire in water non-miscible liquid, that is non-polar flammable 
liquids, that is Class A and B fires such as hydrocarbon fuels, 

For the purpose of deciding whether a particular requirement of this standard is complied with the final value, 
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with 
IS 2 : 1960 'Rules for rounding off numerical values (revised)'. The number of significant places retained in 
the rounded off value should be the same as that of the specified value in this standard. 

IS 15397 ; 2«»3 

Indian Standard 



This standard lays down the requirements regarding 
principle, capacity, material, shape, design, 
construction, anti-corrosive treatment and tests of 
portable mechanical foam type (stored pressure) fire 


The standards given in Annex A contain provisions 
which through reference in this text, constitute 
provisions of this standard. At the time of publication, 
the editions indicated were valid. All standards are 
subject to revision and parties to agreements based on 
this standard are encouraged to investigate the 
possibility of applying the most recent editions of the 
standards indicated in Annex A. 


3.1 The method of expulsion of mechanical foam is by 
air pressure stored in the container. The method of 
operation shall be upright by pressing a trigger type 
squeeze grip mechanism. 

3.2 During the operation, should be able to strike the 
side of the burning surface and engulf fire. 


The total liquid capacity of the extinguisher when filled 
to the specified level indicated in exterior of the body 
shall be 9.0 +£* litres. 


The materials for the construction of various parts of 
the fire extinguisher shall be as given in Table 1 . 

Table I Materials of Construction of Various Parts of Fire Extinguishers 

(Clause 5) 

si No. 




Relevant !S No. 








Neck ring 
Valve body 

Washer and O rings 



Syphon tube sheet 


a) Mild steel sheet 

IS 513 

b) Stainless steel sheet 

IS 69U 

Mild steel 

IS 2062 or IS 1875 

a) Forged brass 

Grade FLB of IS 6912 

b) Leaded tin bronze 

Grade LTB2 of IS 318 

c) Plastic 

Annex B 

d) Stainless steel 

IS 6529 


Requirements in respect of hard- 

ness as applicable to Type 3 of 

IS 5382 and also acid/ alkali 

resistant {see Note) 

a) Brass 

Grade 2 of IS 291 or Type 1 of 

IS 319 

b) Stainless steel 

IS 6528 

Spring steel (plated) 

Grade 1 of IS 4454 (Pan 1) 

a) Brass 

Alloy No. 2 of IS 407 

b) Copper 

IS S545 

c) Plastic 

Annex B 

a) Plastic 

Annex B 

b) Brass 

Grade 2 of IS 291 or Type 1 of 

IS 319 

Braided rubber or braided PVC 

IS 14933 

NOTE __ When a piece of 2.5 cm cut from any portion is dipped in 20 percent sulphuric acid. 5 percent sodium hydroxide solution 
for 10 min. There shall be no sign of corrosion or damage. 

IS 15397:2003 


The shape of the body shall be cylindrical with an 
outside diameter of 175 ± 5 mm. The size of the filler 
opening shall not be less than 20 mm. 


7. 1 The cylinder shall be of welded construction having 
cold or hot drawn cylindrical portion with 
hemispherical, ellipsoidal ortorispherical ends welded 
to it or two halves cold or hot drawn and circumferential 
welded together. Th? end of dished part shall be having 
hemispherical, semi-ellipsoidal or torispherical shape 
and the end shall have cylindrical skirt or parallel 
portion of minimum 10 mm length or three times the 
shell thickness, whichever is greater. The welding shall 
be done by an electric arc welding process. There shall 
not be any longitudinal seam in the cylinder. The 
thickness of the shell shall be calculated in accordance 
with 7.1.1. But it shall not be less than 1.6 mm. The 
neck ring shall be welded with the body of the cylinder 
and shall be threaded to suit the type of valves thread. 
The threads shall be in accordance with Class A of 
IS 2643 (Part t). 

7.1.1' The body shall have measured wall thickness 
greater than the minimum thickness calculated using 
the following formula : 


S - + K 



S ^ minimum thickness, in mm; 

D - external diameter of the body or the largest 
external measurement normal to the longitudinal 
axis in mm; and 

K - coefficient with a value of: 

0.45 for D< 80 mm; 

0.50 for D > 80 mm and < 1 00 mm; and 

0.70 for D> 100 mm. 

7. 1 .2 For austenitic steel bodies, the minimum thickness 
measured shall be greater than the minimum thickness 
calculated using the following formula: 


s - + K 


S ^ minimum thickness, in mm; 

D = external diameter of the body or the largest 
external measurement normal to the longitudinal 
axis, in mm; and 
K = coefficient, the a value of which is 0.030 for 
D> 100 mm. 

This is subject to an absolute minimum thickness of 
0.64 mm, including all tolerances. 

7.1.3 The top and bottom of mechanical foam fire 
extinguisher (stored pressure) shall have a thickness 
after forming equal to or greater than the minimum wall 
thickness of the cylinder unless the dome or bottom is 
formed integral with the cylinder. In the case of integral 
dome and bottom, the thickness of the cylinder shall 
not be more than 15 percent than that of the dome or 

7.2 Gas Space 

7,2.1 A gas space shall be provided above the liquid 
level in the body of the extinguisher, which shall be of 
sufficient volume to ensure that when subjected to 
operation it meets the requirements of performance test 
as given in 10.5. 

7.3 Neck Ring 

7.3.1 The neck ring shall be suitably threaded either 
externally or internally in accordance with Class A of 
IS 2643 (Parts I and 2) or IS 4218 (Part 3). It shall 
have the filler opening size as specified in 6. The 
threaded length shall not be less than 16 mm. 

7.4 Valve 

7.4.1 The screw thread of the valve shall be in 
accordance with Class A of IS 2643 (Part 1 ) or I S 42 1 8 
(Part 3) for a minimum length of 16 mm to suit the 
thread of the neck ring. 

7.4.2 The squeeze grip valve assembly with a spring 
loaded pressure sealed sliding spindle shall be provided 
in such a way that it is operated by manual depression 
by means of a cantilever pivoted grip lever. The spindle 
shall be so designed that the operation of the 
extinguisher can be regulated by means of depressing 
and releasing the extinguisher squeeze grip handle. A 
safety pin/seal shall be provided to prevent inadvertent 
operation by accident. 

7.5 Discharge Fittings 

7.5. 1 Hose and Foam Making Nozzle 

The discharge hose shall be screwed to the valve body. 
The design of the nozzle and its orifice shall be such 
that it meets the performance requirements as given 
in 10.5. The discharge hose shall be of 0.6 m length 

7.5.2 Pressure Gauge 

A suitable pressure gauge shall be fitted to valve 
assembly or to the cylinder to indicate the pressure 
inside the cylinder. The gauge dial shall indicate the 
operating pressure range of the extinguisher preferably 
with the colour code. The zero charging the maximum 
indicated pressure shall be shown in number and 
marked to ensure the correct charging of pressure of 
10kgf/cm 2 . 

IS 15397 : 2003 

7.5.3 Syphon Tube 

The syphon tube shall be fitted with the discharge valve 
assembly by means of a press fit type, soldering, 
brazing or suitable threads in accordance with 
IS 2643 (Part 2). The syphon tube shall not be 
completely disengaged during use, syphon tube shall 
be notched or otherwise prevented from restricting the 
discharge in an unintended manner. 

7.5-4 Charge 

The charge shall consist of foam concentrate 
conforming to IS 4989 (Part 2) and quantity not less 
than 3 litre ( for 6 percent concentrate ) or 1 .5 litre ( for 
3 percent concentrate ) and balance quantity of water. 


8.1 All internal and external surface of the body shall 
be completely epoxy powder coated to minimum 
0.050 mm thickness. The thickness of the coating shall 
be measured as given in IS 3203. The internal surface 
of the body shall be plastic/ rubber coated and lining 
shall be of a minimum thickness of 0.5 mm as an 
alternative to powder coating. 

8.2 Test for Plastic Lining 

a) Test for adhesion of plastic lining (Type test) — 
Subject the unfilled extinguisher to a 
pressure 15 kgf/cm 2 and store for 120 * h at 
27 ± 5 °C. 

Release the pressure and examine the 
extinguisher internally for cracking, separation 
from the wall of the body or lifting of the lining, 
and bubbles between the lining and the body. 

b) Test for continuity of plastic lining ~~ Fill the 
extinguisher body up to 1 mm of the top of the 
lining with a 1 percent mfm solution of NaCI in 
water containing sufficient hydrocarbon 
surfactant to reduce the surface tension of 
the solution to less than 40 mN/m. Check the 
lining for continuity by the application of a 
500 ± 50 M insulation resistance test across the 
lining through connections made to the metal 
body and to an electrode introduced into the 
solution in the extinguisher body. 

8.3 Phosphating in accordance with the provisions of 
IS 3618 may be applied on the externa! surface of the 
body as an alternate. 


9.1 Each extinguisher shall be painted with fire red 
conforming to shade No, 536 of IS 5. The paint shall 
conform to IS 2932. 

9.2 A picture showing operation of the extinguisher in 
the correct manner shall be shown on the body/label of 
the extinguisher. 

9.3 The extinguisher shall be maked with letter A and 
B indicating the suitability for respective class of fire 
as laid down in IS 2190. The alphabet A shall be of 25 
mm size printed in black colour centrally contained in 
an equilateral triangle of 50 mm side. The triangle shall 
be coloured golden yellow conforming to shade 356 of 
IS 5. The alphabet B shall be of 25 mm size printed in 
black colour centrally contained in a square of 40 mm 
size minimum. The square shall be coloured cream 
(lemon yellow) conforming to shade No. 355 of IS 5. 
The paint shall conform to IS 2932. 


10.1 Hydrostatic Pressure Test 

The extinguisher body and valve assembly shall be 
capable of withstanding the internal hydraulic pressure 
of 3.0 MN/m 2 (30 kgf/cm 2 ) without rupture, leakage 
or visible distortion for a period of 2 min. This test 
shall be carried out before the extinguishers are coated 
for anti-corrosive treatment and painting. 

10.2 In case of ultimate failures test, the mechanical 
failure shall not occur at the pressure of less than 
4.5 MN/m 2 (45 kgf/cm 2 ). 

10.3 Retention of Pressure and Resistance to 

10.3.1 An extinguisher shall be emptied, cleaned, 
filled with 8.450 litres of potable water and 550 ml of 
AFFF concentrate 6 percent type and pressurized to 
10.5 kgf/cm 2 using compressed air or nitrogen gas. It 
shall be monitored for at least 30 min, for any leakages. 
In case there is no fall of pressure, the safety pin shall 
be inserted into the proper holes. 

10.3.2 The extinguisher shall then be rigidly mounted 
in an upright position on to the platform of an 
electrically operated vibration testing machine. After 
properly securing the extinguisher, it shall be subjected 
to vibrations for 2 h in each of the three rectilinear axes, 
for 2 h each in the following order : Horizontal, Lateral 
and Vertical. The vibrations to be applied shall have a 
frequency of 40 Hz, that is 40 cycles/s and an 
amplitude of 0.25 ± 0.03 mm. Any drop in pressure 
shall be recorded. 

10.3.3 The above test shall be repeated daily for a 
period of five days. At the end of five days the 
extinguisher shall be observed for any leakage or drop 
of pressure. The extinguisher shall be deemed to have 
passed the tests, if it meets the following requirements: 

a) No physical failure of components occurs which 
would require repair or replacement before the 
extinguisher can be returned to the services. 

b) The extinguisher is found meeting the 
performance test criteria of projection range and 
discharge time and expansion factor of foam, 
as stipulated in 10.5. 

JIS 15397 : 2003 

10.4 Drop Test (Resistance to Shock and 
Mechanical Damage) 

This test shali be conducted at a temperature of 
27 ± 5 °C. The extinguishers shali be filled with water 
up to 90 percent of its volume and pressurized to its 
rated pressure. The extinguisher with its fitting shall 
be dropped from a height of 3 m on a concrete surface, 
without pressure gauge, first with cylindrical axis 
horizontal and second with cylindrical axis vertical 
with its head up. There shall be no leakage from the 
body. The leakage shall be observed by immersing the 
extinguisher in the water. 

Drop test shall be type test. 

10.5 Discharge Performance Test 

10.5.1 The design of the extinguisher body valve and 
foam making nozzle shall be such that when the 
extinguisher is correctly charged by filling in 8.450 litres 
of clean water and 550 ml of 6 percent concentrate 
AFFry liquid [IS 498#(Part 2)] and pressurized to 
10 ± 0.5 kgf/cm 2 and then keeping the foam making 
nozzle horizontal the extinguisher is operated under 
normal ambient temperature conditions 27 ± 5 °C and 
still air the expanded foam shall be expelled out in 
the form of a jet which shall maintain an effective 
throw that is projection range not less than 6 m for 
the minimum period of 25 s provided that at least 
90 percent of liquid contents is discharged out from 
the extinguisher within the maximum period of 60 s. 

The extinguisher shall be charged and pressurized again 
as described in the foregoing and discharged in such a 
manner that the entire quantity of the expanded foam 
is made to fall and collect in a leak proof tray made of 
mild steel sheet having an area of 1 m 1 and side 1 5 cm. 

The layer of foam so collected in the tray shall have a 
thickness of not less than 50 mm 'When measured 
immediately or alternately the expansion ratio measured 
as per the test method given in IS 4989 (Part 2) shall be 
minimum 6. 

110.6 Fire Test (Type Test) 

A square tray having area 2.32 m : (that is each side 
152.3 cm) made out of 6 mm thick mild steel sheet 
shall be taken. The tray shall be all welded and of water 
leak proof joint construction. The height of the sides 
shall be 200 mm. All the upper edges of the tray shall 
be reinforced from outside with 5 mm thick angle iron 
welded continuously around the perimeter. The angle 
iron shall form a turned out edge flush with the top 
edge of the tray. The lower leg of the angle may be 
welded. The tray shall be kept on fiat ground. Water 
shall be poured to form 20 mm thick layer. The 
extinguisher shall be charged and kept ready at a 
distance of approximately 8 m from the nearest edge 
of the tray. 

Twenty Five litres of high speed diesel shall be 
poured into the tray and lit with the help of a burning 
torch. A pre-burn period of 30 s shall be allowed. The 
operator shall hold the foam making branch and squeeze 
together the operation lever and carrying handle to 
operate the extinguisher. 

The operator shall apply the jet foam on the opposite 
free board/wall of the tray by hitting the surface of fuel 
by foam jet. The operator shall apply the foam as gently 
as possible and making effort that entire quantity of 
foam falls into the tray. Initially the operator shall be 
at a distance of about 6 m and may gradually advance 
towards tht tray as fire comes under control and the 
throw diminishes. 

The extinguisher shall be declared to meet the 
requirement of fire test if fire is extinguished within its 
discharge time of 60 s. 

The test shall be performed in still air condition in open 


All the components of the extinguisher shall have 
smooth finish and shall be free from burrs, sharp and 
jagged edges and other visual defects that may be 
injurious or detrimental in any manner to the users. 


12.1 Each extinguisher shall be clearly and permanently 
marked with the following information: 

a) Name of the manufacturer or trade-mark, if 

b) Method of operation in prominent letters; 

c) Words 'Mechanical foam (stored pressure)*; 

d) Capacity of the extinguisher in litres; 

e) Words * Recharge after use' ; 

A declaration to the effect that the body of the 
extinguisher has been tested to a pressure of 
30 kgf/cm 2 ; 

g) The word 'Keep this end up 1 while using; 

h) Letter indicating the suitability of the unit for 
various class of fires; and 

j) Year of manufacture and SI No. of the 

12.2 Each extinguisher may also be marked with the 
Standard Mark. 

12,2,1 The use of the Standard Mark is governed by 
the provisions of the Bureau of Indian Standard Act , 
1986 and the rules and regulations made thereunder. 
The details of conditions under which the licence for 
the use of the Standard Mark may be granted to 
manufacturers or producers may be obtained from the 
Bureau of Indian Standards. 

IS 15397 : 2003 


(Clause 2) 


IS No. 
5: 1994 

291 : 1989 

318: 1981 


407: 1981 

513 : 1994 

1545: 1994 

1875 : 1992 
2062: 1992 

2190: 1992 


(Parti): 1975 

(Part 2): 1975 
2932: 1993 

3203: 1982 


Colours for ready mixed paints and 
enamels (fourth revision) 

Naval brass rods and sections for 
machining purposes {third revision) 

Specification for leaded tin bronze 
ingots and castings (second revision) 

Free cutting leaded brass bars, rods 
and sections (fourth revision) 

Specification for brass tubes for 
general purposes (third revision) 

Cold rolled low carbon steel sheets 
and strips (fourth revision) 

Solid drawn copper and copper alloy 
lubes for condenser and heat 
exchangers (third revision) 

Carbon steel billets, blooms, slabs 
and bars for forgings (fifth revision) 

Steel for 
purposes — 

general structural 
Specification (fourth 

Selection, installation and 
maintenance of first-aid fire 
extinguishers — Code of practice 
(second revision) 

Dimensions for pipe threads for 
fastening purposes: 

Basic profile and dimensions (first 

Tolerances (first revision) 

Enamel, synthetic, exterior (a) 
undercoating, (b) finishing — 
Specification (second revision) 

Methods of testing local thickness 
of electroplated coatings (first, 

IS No. Title 

3618:1966 Specification for phosphate 

treatment of iron and steel for 
protection against corrosion 

4218 (Part 3) : ISO general purpose metric screw 
1976 threads : Part 3 Basic dimensions 

(second revision) 

4454 (Part 1): Specification for steel wires for 

2001 mechanical springs: Part 1 Patented 

and cold drawn steel wires — 

Unalloyed (third revision) 

4989 (Part 2) : Specification for foam concentrate 

1984 (compound) for producing 

mechanical foam for fire fighting: 

Part 2 Aqueous film forming foam 


5382 : 1985 Specification for rubber sealing 

rings for gas mains, water mains and 
sewers (first revision) 

5762 : 1970 Methods for determination for point 

and melting range 

6528 : 1995 Stainless steel wire (first revision) 

6529 : 1996 Stainless steel blooms, billets and 

slabs for forging (first revision) 

691 1 : 1992 Stainless steel plate, sheet and strip 

(first revision) 

6912:1985 Copper and copper alloy forging and 

forgings (first revision) 

7188 : 1974 Methods of test for cellulose acetate 


8543 (Part 1/ Methods of testing plastics: Part 1 

Sec 2): 1979 Characterization of polymer 

structure and size, Section 2 

Determination of density of solid 


1 493 3 T 2001 High pressure fire fighting hose — 

IS 15397 : 2003 


(Table I) 



From a sample of cap, requirements of following 
properties shall be checked: 



Method of Test, Requirements 
Refto IS 

i) Specific gravity IS 8543 L25 ± 0.02 

(Part I /Sec 2) 

ii) Melting point IS 5762 215 to 225° C 

iii) Ash content IS 7188 1 5 ± 1 percent 


B-2. 1 If the sample passes the requirement mentioned 
in B-l, the following burst pressure test shall be done 
s second samole. 

on the second sample. 

B-2.2 The sample of cap shall be subject to internal 
hydraulic pressure of 5 MN/m 2 (50 kgf/cm 2 ) after 
blocking the plunger hole (if any). The pressure shall 
be built up gradually over a period of 30 s and 
maintained for 1 min. There shall be no mechanical 
failure of cap and cap threads. 


B-3.1 If the sample passes the requirement mentioned 
in B-2.1 and B-2.2, the following tests shall be done on 
the third sample in the order as indicated below and the 
sample shall pass all the tests. 

B-3.2 Acid Resistance Test 

The sample shall be submerged in 10 percent dilute 
hydrochloric acid for 72 h at the temperature of 
27 ± 3 °C. It shall then be removed, rinsed with potable 
water and dried. The sample shall not show any sign 
of discolouration, distortion or deterioration of any kind. 

B-3.3 Alkali Resistance Test 

The sample shall then be submerged in 10 percent 

sodium bicarbonate solution for 72 h at a temperature 
of 27 ± 3 °C and then shall be removed, rinsed with 
potable water and dried. The sample shall not show 
any sign of discolouration, distortion or deterioration 
of any kind. 

B-3.4 The sample shall then be screwed and unscrewed 
into neck ring of the fire extinguisher for 100 times 
(each operation). The samples shall not show any sign 
of damage or distortion of threads. The sample shall 
then be first tested for internal hydrostatic pressure of 
4.5 MN/m 2 (45 kgf/cm 2 ) after blocking the plunger 
hole (if any). The pressure shall be built up over a 
period of 30 s and maintained for I min. There shall 
not be any sign of leakage. It shall be then kept 
suspended in an oven maintaining the temperature of 
60 ± 1 °C for 72 h and after removing when it attains 
temperature of 27 ± 3 °C, it shall be kept in refrigerator 
at a temperature of -5 ± I °C for 72 h. After this period, 
the sample shall be removed and when it attains the 
temperature of 27 ± 3 °C and at this stage, it does not 
show any sign of discolouration, distortion or 
deterioration of any kind, it shall be subject to internal 
hydrostatic pressure test as mentioned above and there 
shall not be any sign of leakage. This cycle of test (that 
is, keeping in oven then in refrigerator and subjecting 
to hydrostatic pressure) shall be further repeated 2 times 
with a gap of 24 h and the sample shall be observed 
and shall not show any sign of discolouration, distortion 
or deterioration besides passing the hydrostatic pressure 

B-3.5 Ultra Violet Exposure Test 

The sample shall then be exposed at 27 ± 3 °C to xenon 
arc ultra violet radiations for 100 min followed by 
exposure at a relative humidity of 60 ± 5 percent and 
temperature 62 ± 5 °C for 20 min. The cycle shall be 
repeated 60 times and the cap shall then be subjected 
to internal hydrostatic pressure mentioned in B-3.4 and 
shall pass requirements. 

Bureau of Indian Standards 

BIS is a statutory instiiyitf^^|6n$he<S under the Bureau of Indian Standards Act, 1986 to promote harmonious 
development of the activates of standardization, marking and quality certification of goods and attending to 
connected matters in the cou^fry. ; 

Copyright • y *V 

BIS has the copyright *$f ail its publications. No part of these publications may be reproduced in any form 
without the prior permission jin writing of BIS. This does not preclude the free use, in the course of implementing 
the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to 
copyright be addressed t# the Director (Publication), BIS. 

Review of Indian Standards 

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed 
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are 
needed; if the review ^dieates that changes are needed, it is taken up for revision. Users of Indian Standards 
should ascertain that thiy are in possession of the latest amendments or edition by referring to the latest issue of 
'BIS Catalogue" and 'Standards: Monthly Additions'. 

This Indian Standard has been developed from Doc: No. CED 22 (6002). 

Amendments Issued Since Publication 

Amend No. 

Date of Issue 

Text Affected 


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